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	Provedor de dados ArchiMer (2) Autor Gueguen, Bleuenn (2) Rouxel, Olivier (2) Sorensen, Jeffry V. (2) Toner, Brandy M. (2) Lalonde, Stefan (1) Pena, Jasquelin (1) Peña, Jasquelin (1) Stewart, Brandy D. (1) Mais... Palavra-chave Birnessite (1) Fe-oxyhydroxides (1) Ni EXAFS (1) Ni stable isotope fractionation (1) Nickel isotopes (1) Sorption experiments (1) Surface complexation (1) Tracer development (1) Mais... Tipo do documento Text (2) Ano 2020 (1) 2018 (1) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Large nickel isotope fractionation caused by surface complexation reactions with hexagonal birnessite ArchiMer Sorensen, Jeffry V.; Gueguen, Bleuenn; Stewart, Brandy D.; Peña, Jasquelin; Rouxel, Olivier; Toner, Brandy M.. Manganese oxides are an important sink for Ni in the ocean. To explore the potential of Ni stable isotopes as a geochemical tracer, we conducted two types of sorption reactions between Ni and hexagonal birnessite in 0.05 M NaNO3 media: one where we varied pH from 5 to 8 (constant initial Ni concentration = 170 μmol/L), and a second where we varied the initial dissolved Ni concentration from 17 to 426 μmol/L (constant pH = 7.7). Isotopic measurements were made on both the solid phase and the supernatant solutions to determine the Ni isotope fractionation factors (∆60/58Nimin-aq = δ60/58Nimin − δ60/58Niaq) between the mineral and aqueous phases. Nickel extended X-ray absorption fine structure (EXAFS) spectroscopy showed Ni in two distinct bonding... Tipo: Text Palavras-chave: Ni stable isotope fractionation; Ni EXAFS; Surface complexation; Birnessite; Tracer development. Ano: 2020 URL: https://archimer.ifremer.fr/doc/00606/71799/73086.pdf Variable Ni isotope fractionation between Fe-oxyhydroxides and implications for the use of Ni isotopes as geochemical tracers ArchiMer Gueguen, Bleuenn; Sorensen, Jeffry V.; Lalonde, Stefan; Pena, Jasquelin; Toner, Brandy M.; Rouxel, Olivier. Nickel (Ni) isotopes have recently emerged as a new biogeochemical tracer in marine environments, but our understanding of the mechanisms of Ni isotope fractionation in natural systems with regards to its fractionation by mineral surfaces is incomplete. This study aims to provide experimental constraints on Ni isotope fractionation during adsorption to goethite and 2-line ferrihydrite, two Fe minerals that vary in terms of distinct crystalline properties. We conducted two types of adsorption experiments: one with variable pH (5.0 to 8.0) and constant initial Ni concentration, one at a constant pH of 7.7 and variable initial Ni concentrations. Isotopic measurements were made on both the solid phase and the supernatant solutions in order to determine the Ni... Tipo: Text Palavras-chave: Fe-oxyhydroxides; Sorption experiments; Nickel isotopes. Ano: 2018 URL: https://archimer.ifremer.fr/doc/00423/53473/56649.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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